Hot-air furnace



(No Model.) 4 Sheets-Sheet l.

H.A.TINKHA1VI.

HOT AIR FURNACE.

No. 604,552. Patented 'May 24,1898.

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(No Model.) 4 `Sheets-Sheet 2. H. A. TNKHAM.

HOT AIR FURNAGE. No. 604,552. Patented May 24,1898.

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(No Model.) 4 Sheets- Sheet 3.

H. 4A; HNKHAM. HOT AIR FURNAGE.

No. 604,552. Patented May 24,1898.

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H. A. TINKI-IAM. HHOT AIR PURNAGE.

Patented May'24,1898.

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IIO'WARD A. TINKHAM, OF NORTON, MASSACHUSETTS, ASSIGNOR TO THE VHITEVARNER COMPANY, OF TAUNTON, MASSACHUSETTS.

HOT-AIR FURNACI.

SPECXFICATION forming part of Letters Patent No. 604,552, dated May 24,1898.

Application filed November 8, 1897. Serial No. 657,746. (N0 model.)

.To all whom it may concern:

Be it known that I, HOWARD A. TINKHAM, a citizen of the United States,residing at Norton, in the county of Bristol and State of Massachusetts,have invented certain new and useful Improvements in Hot-Air Furnaces,of which the following, taken in connection with the accompanyingdrawings, is a specification.

One of the objects of my invention is to make a hot-air furnace havingan auxiliary at the end thereof.

In the drawings, Figure 1 is a vertical section from front to rear of afurnace embodying myinvention, the outside casing and some otherunessential parts being omitted. Fig. 2 is a horizontal section on line2 2 of Fig. 1. Fig. 3 is a perspetive, partly broken away, of a furnaceembodying my invention. Fig. 4c s a detail perspective of the diaphragmof the auxiliary radiator. Fig. 5 is a plan of the plate forming thebottom of the auxiliary radiator. Fig. 6 is a section on line 6 6 ofFig. 5. Fig. 7 is a front elevation showing the dust-hue connectionbetween the ash-pit and the auxiliary radiator.

My invention -is represented as applied to a portable hot-air furnace,in which 1 is the main radiator,inclosing the lire-chamber, and 2 is theoutside supplemental or auxiliary radiator. This auxiliary radiator isof the type commonly called the horseshoe form-that is, it partiallysurrounds the main radiator and there is an air-space between the tworadiators. The auxiliary radiator is sup- It is also supported at therear by the smoke-flue where it enters the chimney. Rods 6 connect theplates 21, which form the top and bottom of the radiator. Aconnecting-collar 7 between the main radiator l and the auxiliaryradiator 2 forms the only flue between the two radiators. This flue ispreferably midway of the curve of the radiator and opposite thefeed-door. Preferably also for convenience it is composed of twosections end to end, lapping onto each other. The auxiliary radiator isdivided into an upper and lower chamber bya diaphragm which does notextend quite to the front ends of the radiator, so that there arepassageways between the two chambers at the forward ends of the arms ofthe diaphragm. This diaphragm is preferably the full width of theradiator and made to dip downward from each side of the flue toward thefront for purposes which will be explained hereinafter. For convenienceof construction and of setting in position the diaphragm is composed oftwo of said arms or plates 8,Which form the deflecting portion, boltedto a middle portion 9, which is of trough shape with inclined or bevelbottom. .This trough leads from the auxiliary radiator directly to thedraft-collar 10. Secured to this middle portion 9, preferably by boltsor screws, is a rearwardly-extending plate 11, which projects into thedraft-collar 10 and extends widthwise to the sides of the collar.Directly at the rear of the plate 11 there is a draft-damper 12, whichwhen closed closes the passage on the upper side of the plate 11,wherebythe draft maybe made direct or indirect, as desired. The plate 11 has anupwardly-proj ectin g lip 13, against which the damper 12 strikes whenit is closed. The diaphragm is supported at the middle partly by theplate 11, resting on flanges 14, which project inwardly from the sidesof the draftcollar 10, and partly by the inner ends of thedeflecting-plates 8, near the union with the bevel-plate 9, resting onlugs 15, which project from the collar 43 around the draft-opening onthe inside of the inner wall of the auxiliary radiator. Thedeflecting-plates 8 have ears 16 on their outside edges near the ends.Bolts 17 pass through holes in these ears and through the wall of theauxiliary radiator and hold the plates 8 in position. The dia- IOO ` anda new plate can with equal facility be substituted. The outside collar18, to which the smoke-pipe is connected, is pinned to the collar 10,and by disconnecting the said collar 18 the plates 9 and 11 can bereadily detached and taken out, making easy access for repairs and forcleaning the furnace. The deflecting-plates extend nearly but not quiteto the ends of the arms of the auxiliary radiator' 2, being sufiicientlyshort to allow for' the circulation around the ends. The arms alsoextend downward to a short' distance fromthe bottom. The combinedsectionalE area of the passages at thel ends of both deflecting-platesshould be about equal to the sectional area of the passage to theindirect outlet to the draft-collar, where .the twocurrents meet, tosecure the best results.

Vhen the damper 12 is open, the draft Y will be direct from thecombustion-chamber ofthe deiiecting-plates S into the lower chamber,thence returning to the rear part ofthe radiator and rising, thecurrents from both arms uniting on the under side of the bevelplate 9and passing together out through the draft-collar 10 on the under sideof the plate 11, and thence out through the collar 18 the same as didthe direct draft.

By giving the deiiecting-plates avdownward dip the products ofcombustion are compelled to circulate throughlall parts of the radiatorfromtop to bottom. As the products from the combustion-chamber have atendency on their returncourse to hug the under side of the diaphragm,if the radiator be quite deep the currents will not reach the bottompart'v of the ylower chamber, and therefore the radiator will notbe-evenly heated. By dipping the diaphragm the current is compelled totake a curve which carries it down into the lower forward ends of theradiator before it canA return, and in this way a considerablydeeperauxiliary radiator can be employed thanwhen the deflector ishorizontally disposed, and the radiator will be more evenly' diator iscomposed of sheet-iron or sheet-steel, which being bent around into thehorseshoe form and doubling upon itself at the ends is very springy. Thetop and bottom plates, which are exactly alike, are made of cast metal,having a iiange 22, which extends entirely around the margin of theplate and which -on the bottom plate forms the rest for the side wallsof the radiator and which on the top plate rests on the upper edges ofthe walls of the radiator. For convenience of description I shall speakof the bottom plate particularly. In order to hold the side walls inplace and in form, a lip 23 rises from the ian ge 22 along its innerperiphery at the edge thereof, and a lip 24 rises from the iiange of theouter periphery, but back from the edge. These lips, it will be noticed,lap by each other at the ends. If the radiator were a complete circle orcylinder, like a stovepipe, then Lthe lip might be continuous and theiange projecting outward all the way around, so that the cylinder wouldset outside of the lip just asa stovepipe is connected with its collarby setting it outside the Iiange or lip.

By reason of the peculiar action of the sheet metal when made in thehorseshoe form it is found that if the lip were all inside the strainand pressure to which the radiator isV subjected in setting it up anddriving it on will spring it out of form and alter its shape, as.

yif the two arms are pressed toward each other ,the tendency is for theinner and outer walls to spread in opposite directions. By making -thelips in the manner described above the iouter periphery or wall of theradiator goes outside of the lip 24said lip also being car- Iried aroundpast the bend at'the ends. The linner wall of the-radiator is inside ofthe lip 23.

What I claim is* 1. In ahot air furnace, in combinationwith ',the mainradiator, an auxiliary radiator' outside of the main radiator, anair-space between the outside wall of the main radiator yandthe insidewall of the auxiliaryradiator,

a diaphragm dividing the auxiliary radiator into an upper and a lowerchamber, with a passage between said chambers at each'end `thereof,asingle cross-due connecting the main radiator with said upper chambermidway of IOO IIC'

the ends ofsaidchambera single outlet-nue* for both chambers midway ofthe ends thereof,` :a plate extending from the diaphragm part ,way intosaid outlet-flue, and a damper for the portion of the iue above saidextensionvplate, substantially as described.

v 2. In a hot-air furnace, in combination with the main radiator, anauxiliary radiator outjside of the main radiator,l an air-space be-@tween the outside wall of the mainl radiator @and the inside wall oftheauxiliary radiator,v

ga single cross-Hue connectingthemain radiator with said' auxiliaryradiator midway of the ends thereof, asingle outlet-fine for thelauxiliary radiator opposite the inlet-huev and tof larger sectionalareaa bevel-plate extending crosswise of the auxiliary radiator from thelower edge of the inlet-flue to about midway of the outlet-opening,diaphragm-plates extending from both sides of said bevel-plate towardthe ends of the auxiliary radiator dividing said radiator into an upperand a lower chamber with a passage between them at each outer endthereof, a plate extending from the bevel-plate into the outlet-Hue anda damper for the portion of the flue above said extension-plate,substantially as described.

3. In a hot-air furnace, in combination with the main radiator, anauxiliary radiator outside of the main radiator, an air-space betweenthe outside wall of the main radiator and the inside wall of theauxiliary radiator, a single cross-flue connecting the two radiatorsmidway of the ends of the auxiliary radiator, an outlet-Hue from theauxiliary radiator, a bevel-plate with side walls extending crosswise ofthe auxiliary radiator the full width thereof from the lower edge of theinletiiue to about the middle of the outlet-opening, diaphragm-platesextending from the upper edge of both side walls of said bevel-platetoward the ends vof the auxiliary radiator dividing it into an upper anda lower chamber with end passages, and a damper for that portion of theoutlet-fine above the bevel-plate, substantially as described.

4. In a hot-air furnace, an auxiliary radiator,an inlet-lineintermediate the ends thereof, an outlet draft-opening and collarconnection, a diaphragm which divides the said radiator into an upperand a lower chamber with passage-ways between the chambers at the endsthereof, said diaphragm comprising a bevelbottomed plate which forms themiddle piece and two deflecting-plates detachably secured to the middlepiece and extending toward the ends of said radiator, a plate detachablysecured to said bevel-plate and projecting into the draft-openingdividing it crosswise, a damper above said plate for the upper portionof the draft-collar, and a support for the diaphragm and plates,substantially as described.

5. A top and bottom plate for a segmental radiator consisting of asegmental plate, an upwardly-projecting lip around the inner periphery,an outwardlyextending ange around the outer periphery and around theends, and an upwardly-projecting lip around inside of said flange, saidsecond lip extending around the ends inside of the flange and past theends of the inner lip, the two lips being spaced apart at theirpassing-points to admit the wall of the radiator, substantially asdescribed.

In testimony whereof l have signed my name to this specification, in thepresence of two subscribing Witnesses, on this 5th day of November, A.D. 1897.

HOWARD A. TINKI-IAllL Witnesses:

EDITH J. ANDERSON, WILLIAM A. COPELAND.

